On pytest how could I transfer byte array as an input to the smart-contract like in solidity browser?

[avatar-lavventura]

• Populus Version: 2.2.0
• OS: osx

solc --version
solc, the solidity compiler commandline interface
Version: 0.4.18-develop.2017.9.23+commit.ccb68970.Linux.g++

Please note that I couldn't solve this problem for months, I have tried everything :(

I have following contract; I can call set()with following byte array on solidity browser. The smart contract accepts the input as bytes32. I assume if geth and solidity browser sees a string starting with 0x, it converts it to byte format.

Following transaction call works without having any problem.

myContract.set("0x15CEF23823A9410D60CB6E6CC56046EC6035A9353100476EA28C94752AF104CD")

--

myContract.get()
Returns: "0x15CEF23823A9410D60CB6E6CC56046EC6035A9353100476EA28C94752AF104CD

My contract:

contract Contract {
  bytes32 public hash;
  function set(bytes32 hash_) returns (bool success)
  {
        hash = hash_;
  }
  function get() constant returns bytes32 {
     return hash;
   }
}

---

I want to do same operation on Populus.
When I try to call it as on test_greeter.py:

def test_greeter(web3, accounts, chain):
    myContract, _ = chain.provider.get_or_deploy_contract('Lottery')
    set_txn_hash = myContract.transact().set("0x15CEF23823A9410D60CB6E6CC56046EC6035A9353100476EA28C94752AF104CD")

It gives following error, I assume python sees the input given to set() as string instead of bytes. And the string version of the input exceeds the byte32.

   @classmethod
    def _encode_abi(cls, abi, arguments, data=None):
        argument_types = get_abi_input_types(abi)

        if not check_if_arguments_can_be_encoded(abi, arguments, {}):
            raise TypeError(
                "One or more arguments could not be encoded to the necessary "
                "ABI type.  Expected types are: {0}".format(
>                   ', '.join(argument_types),
                )
            )
E           TypeError: One or more arguments could not be encoded to the necessary ABI type.  Expected types are: bytes32

[Q] While using Populus on pytest how could I transfer byte array as an input to the contract like in solidity browser?

Thank you for your valuable time and help.